13" aluminum unibody, 2.0 or 2.4 GHz Core 2 Duo processor.

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Machine turns off even though there seems to be ample battery capacity

After having had this machine for a little over two years, the battery has about half of its useful life according to the battery statistics in the system monitor application (3300 mAh, 148 charge cycles). Yet when running on the battery and the battery monitor in the top right of the screen has dropped to about 91%, the machine simply shuts off as if there was too little power, with no warning or other indication. While buying a new battery is of course an option, my gut feeling is that the real problem lies elsewhere. Has anyone else had a similar problem and was able to solve it?

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That is an extremely low amount of capacity for that many charge cycles. Looks like you have a defective battery. If you can boot without the battery connected I would rule out a bad DC in and confirm the bad battery. I have a 2009 Macbook (non unibody) with almost triple the charging cycles and it has over double the capacity of your battery. That battery is defective. I would check with Apple and make sure that this isn't a known issue and you might get a free replacement. Worth a shot.

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As I understand, the original capacity for the battery is around 5200 mAh (don't remember where I saw that figure, one site listed 4800 mAh for a replacement battery, still in the same ballpark though), so 3300 mAh doesn't seem overly low to me. We've got an IBM Thinkpad in the household too, with a three year old battery in roughly the same condition (half the remaining capacity and 150 cycles) which still gives 2h of battery time.

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Actually (after searching the 'net some more), it seems the factory capacity for the battery for this model is 4200 mAh (which translates to about 45Wh), not 5200 mAh. At any rate, 3300 mAh seems to be more than half the remaining capacity.

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